Java DataInputStream readInt()方法

java.io.DataInputStream.readInt() 用于读取输入字节并返回int值。

1 语法

public final void readInt()

2 参数

无

3 返回值

此方法读取四个字节并返回一个int值。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.DataInputStream.readInt()方法的例子
 */
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Demo {
    public static void main(String[] args) throws IOException {
        InputStream is = null;
        DataInputStream dis = null;
        FileOutputStream fos = null;
        DataOutputStream dos = null;
        int[] i = {128,250,430,520,820};

        try {
            // create file output stream
            fos = new FileOutputStream("d:\\test.txt");

            // create data output stream
            dos = new DataOutputStream(fos);

            // for each int in int buffer
            for(int j:i) {

                // write int to data output stream
                dos.writeInt(j);
            }

            // force data to the underlying file output stream
            dos.flush();

            // create file input stream
            is = new FileInputStream("d:\\test.txt");

            // create new data input stream
            dis = new DataInputStream(is);

            // available stream to be read
            while(dis.available()>0) {

                // read four bytes from data input, return int
                int k = dis.readInt();

                // print int
                System.out.print(k+" ");
            }

        } catch(Exception e) {
            // if any error occurs
            e.printStackTrace();
        } finally {
            // releases all system resources from the streams
            if(is!=null)
                is.close();
            if(dis!=null)
                dis.close();
            if(fos!=null)
                fos.close();
            if(dos!=null)
                dos.close();
        }
    }
}

输出结果为：

128 250 430 520 820